Launcher pips don't show when app is focussed

I opened xchat and for some reason it's not got a filled triangle on the left of the launcher icon. It's like bamf thinks it's on another desktop or screen. Prior to starting xchat I did have it running whilst I was connected to an external display. I ejected my laptop from the docking back (thus removing the external display) and have suspended / resumed a couple of times since. xchat was closed though, I started it and now it seems to be in this odd orphaned state.

Screenshot attached.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: bamfdaemon 0.2.118-0ubuntu0.1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Sat Jul 7 11:52:51 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: bamf
UpgradeStatus: No upgrade log present (probably fresh install)